Apple leaf curl moth pest is a common fruit tree disease in the apple producing areas of northern China, of which the top slight leaf curl moth and the small yellow leaf curl moth occur most commonly, followed by the macular leaf curl moth, apple leaf curl moth, brown leaf curl moth. Long-term observation has found that the top slightly leaf curled moth mainly causes harm to the new slight, of which the harm to young tree seedlings is the most serious, while the small yellow leaf curl moth, brown leaf curl moth, apple leaf curl moth, etc. not only harms the new slight leaf, but also harms the fruit. Especially in recent years, the unrestricted use of pesticides and the lack of timely control measures have made the occurrence of this pest more serious in Tai'an orchards, even reaching 41.3%, which seriously restricts the development of the local apple industry.
In response to this infinitely rampant apple insect pest, Xiaobian shares with you five tricks to cure moths, hoping to help you.
1. Artificial prevention and control
Combined with management measures such as flower thinning, fruit thinning and pruning, the branches and leaves infected with leaf curl moths are cut off in time, and buried intensively to eliminate harmful larvae and reduce the amount of insects in the field. This work generally begins when the overwintering larvae begin to infest after the apples have flowered, which is about the time period now.
Second, characteristic booby traps
According to the phototropism and chemotaxis of the leaf curl moth, appropriate methods are used to trap and kill. Leaf curl moths are generally used to carry out activities at night, so they can set up black lights in the field and then combine some potions to trap them, and they can also be booby-trapped by fruit vinegar or sweet and sour.
3. Pharmaceutical prevention and treatment
Leaf curl moth pests have many types, and the agents used in control are different, but in production, we mainly focus on the first use of drugs. The first spraying period of apple leafroller moth, brown leaf curl moth and apple leaf curl moth is after apple flowering, and the key period of the second spray is the first generation of larvae incubation, about mid-June. The critical period for the first spray of the Macular Leafroller Moth and the Apical LeafrollEr Moth is before flowering after germination, and the second spray is around mid-June. Studies have shown that the control of leaf curl moths is best performed before the larvae roll leaves. Specifically, the following agents can be used: 75% octyl thiophos emulsion 2000-3000 times liquid, 20% permethrin emulsion 4000 times liquid and so on.
4. Biological control
Biological control is the use of natural enemies of curly leaves for control, such as the release of their natural enemies red-eyed wasps. The control period is generally carried out at the peak of the leaf curl moth.
Fifth, dormant period prevention and control
Before the apple germinates, scrape the coarse skin, warped skin, etc. on the branches of the tree, shear the saw opening, etc., and eradicate the larvae that overwinter here, in addition, you can also combine the winter shear to cut off the branches slightly curly leaf buds, and then eradicate the overwintering larvae on the branches. Before germination, completely remove the leaves and weeds in the orchard, carry out centralized destruction, and then eliminate the overwintering leaf curling moths on the leaves and weeds, and then spray 3-5 baume degrees of stone sulfur compound to kill the residual insect pests in the whole garden.